METHYLENE FURANONE DERIVATIVES AND USE OF SAID DERIVATIVES AS A PHOTOPROTECTING OR ANTIOXIDANT OR DEPIGMENTATION AGENT IN COSMETIC OR DERMATOLOGICAL COMPOSITIONS
申请人:Marchal Estelle
公开号:US20110184059A1
公开(公告)日:2011-07-28
The present invention relates to novel methylene furanone derivatives as well as the use thereof as a protective, antioxidant, or depigmentation agent in cosmetic or dermatological compositions.
The invention also relates to a method for preparing said derivatives involving a Suzuki-Miyaura coupling reaction from corresponding dibromofuranone derivatives.
The invention also relates to a method of preparation involving a coupling reaction of 2-methoxy-furan derivatives with a ketone followed by dehydration.
the orthoesters are prepared. can be hydrolyzed under acidic conditions to give 5-alkylidene-2(5H)-furanones . Reaction of 1,2-hydroxyketones and (2,2-diethoxyvinylidene)triphenyl-phosphorane (2) via Michael addition and Wittig reaction yields orthoesters , which can be hydrolyzed to give 2(5H)-furanones and 2-ethoxyfurans respectively.
Au-allenylidene promoted decarboxylative annulation to access unsaturated γ-lactams/lactones
作者:Xuelun Duan、Haotian Shi、Yangyang Yue、Wangze Song
DOI:10.1039/d4cc00200h
日期:——
A novel Au-allenylidene promoted decarboxylative annulation by intramolecular α-nucleophilic addition has been disclosed. The unsaturated cyclic ethynylethylene carbamates/carbonates can be converted to unique nucleophiles attached with alkylidene ketenes by sequential decarboxylation and oxidation processes. Such alkylidene ketenes can be rapidly trapped by intramolecular α-attacking annulation to
DERIVES DE METHYLENE FURANONE ET UTILISATION DE CES DERIVES EN TANT QU'AGENT PHOTOPROTECTEUR OU ANTIOXYDANT OU DEPIGMENTANT DANS DES COMPOSITIONS A USAGE COSMETIQUE OU DERMATOLOGIQUE.